EP 0586305 A3 19950201 - Method for the production of polyester for a film.
Title (en)
Method for the production of polyester for a film.
Title (de)
Methode zur Polyesterproduktion für Filme.
Title (fr)
Méthode de production de polyester pour un film.
Publication
Application
Priority
KR 920016045 A 19920903
Abstract (en)
[origin: EP0586305A2] The invention deals with a method for the production of polyester suitable to be molded into a film with excellent surface properties. The method comprises : passing dispersion-in-water type silica sol with pH 8 to 11 including sodium oxide or ammonia as a stabilizer and silica particles with average diameters 0.01 to 0.3 mu m through a column of cation exchange resin having the following formula 1 : <CHEM> and through a column of strong basic anion exchange resin having the following formula 2 : <CHEM> in sequence to adjust the pH value to 2 to 4; adding an hydrogen bonding agent and ethylene glycol thereto; heating the resultant silica sol under a reduced pressure to remove water and refluxing at the atmospheric pressure so as to obtain dispersion-in-ethylene glycol type silica sol; and adding 0.01 to 5 % by weight of the dispersion-in-ethylene glycol type silica sol, as based on the weight of polyester to be produced, at any step during the ester interchange reaction.
IPC 1-7
IPC 8 full level
C08G 63/78 (2006.01); C08K 3/36 (2006.01)
CPC (source: EP KR US)
C08G 63/78 (2013.01 - EP US); C08J 5/18 (2013.01 - KR); C08K 3/36 (2013.01 - EP US)
Citation (search report)
- [A] EP 0236945 A2 19870916 - NIPPON CATALYTIC CHEM IND [JP]
- [A] US 3351561 A 19671107 - ALBRECHT WILLIAM L, et al
- [A] AU 5204264 D
- [A] DATABASE WPI Week 9228, Derwent World Patents Index; AN 92-229355
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0586305 A2 19940309; EP 0586305 A3 19950201; KR 940007083 A 19940426; KR 960009293 B1 19960718; US 5382651 A 19950117
DOCDB simple family (application)
EP 93402139 A 19930902; KR 920016045 A 19920903; US 10706793 A 19930817